Dustless rock drill



. INVENTOR ljzZa Cflfmaen I Y HIS An NEY C C HANSEN DUSTLESS ROCK DRILL Filed Nov 12.

. 1, /a V v Dec. 8,1925

Patented Dec.- 8, 1 925 I I "oiihn xins' c. HANSEN, iOFJEASTbNQI enn'nsy'nvania, lissrenoa [To N E RSQ CO PANY, amnesi C I'ItY,'NE W JEBSEYQA 'oonroR-Amon on NEW J RSE Application filed November 12 192 1. Serial' lio 749fl74;

To all whom it may ooncemh i Be it known that I, CHARLES C; IIANSEN, a)-citizen-of the United Statesgmid resident of-=Easton, "county of- Northampton,

State of Pennsylvania, have invented a certain "Dustless Rock Drill, of which the "fol lowing is a specification accompanied by This invention relates to fluid actuated rock drills of the'L-hamnien type," but --more particularly'to rock drills in which motive fluid ispreve'nt'e'd from passing through the drill steel intoathe drill hole.

Pliock drills emplo'yed'in mining and similar operations are usually lprovided with means for cleansing the drill hole, which may" consist of a tube or tubes extending centrally through the drill and communicating attheir forward 'ends with the 1101 low bore of thedrill'steeh'thus;forminga direct path for the cleansing 'fluid's from their respective sources of supply to thedrill hole for removing cuttingsf The cuttings 1e moved from the hole are for the most partwet but due to the presence of motivefluid, leaking from the cylinder under pressureinto the drill steel along with the water, some of the finer rock particles are blown out of the drill hole as dust or suspended in a mist. In some instances, owing to the particular nature of the rock'being drilled, the inhalation of dust is injurious to the health of the operator. v

It has been found that a rock drill may be constructed so that motive fluid leaking past the percussive elements toward the front end of the drill maybe exhausted through suitable channels directly from the interiorof the drill to atmosphere, thus preventing leakage of the motive fluid into the drill hole and consequently preventing the formation of mist. The principal ob ec-t of'this invention is to prevent the passage of leak:

age air into a drill hole by exhausting it directly fromthe interior of the drill to at mosphere. 7

Other objects will hereinafter be pointed out, andthe invention is illustrated in one drawings, in which 7 p a y Figure 1 is a longitudinal elevation partly in section of a hand held dustless'rock drill,

and

of its preferred forms in the accompanying Figure "2 is "a transverse view i taken in the direction of'the arrows. I Referring torthe drawings in which the through Figure loathe line 2'2 lookinginvention-isshown: embodied in a rockdrill thehand held type, a cylinder A, front 7 head B and back hea dC having a suitable. handle, are held in operative relation by the usual side bolts'jfnotshown); Disposed" within the cylinder is areciprocatory hammer piston I), having head,- and afluted reduced cylindricalforward extension to deliver: blows upon a 3 hollow drill steel E, exe" tend ng into the forward end of the {front head B andhel'd in alignment by means of j a chu'ekibushing E, which in this instance is press fitted into a hollow herein the; r01}- wardend of a chuck G, and rotatalole':thereshoivnyin'a-va'lve chest l 1 with-within the 'front head B. Motive fluid, is supplied tolfthefdrill throughfa:con duit f i H and is distributed byaisuitahlevalvc (not *Injorder'tosupply 'cleansingdiquid, such a "reduced "forward end and I supported [at its 'rearwardend within the ba ck head (his arranged centrally I th rough the permissive element and extends at its forward end into' the drillsteel E. Rotation of the drill steel is in this instance etfected'by a rifle barL,

having a fluted reduced forward extension and a head supporting a pluralityof pawls which cooperate with" a suitable rotation ratchet 0, while theflute d extension of'the rifle bar L cooperates with the rifle nut P, arranged in the'head of the piston D, said nutbeing preferably held therein by means of screw threads. The chuck G is provided p with internal flutes Q cooperating with the flutes in the forward extension of the piston steel free within the drill hole.

Means a are provided for preyentingthe 7 motive fluid leaking out of the forward end: of the cylinder A from passing through the,

To this: end the front'cylinder washer- R isv formed with cylindrical rearward and forward extensions which are adapted to project into suitable-bores Within the cylinder "A and the; p front, head "B "respectively. Within the drill steel E tothe drill hole.

washer R there is provided a hollow bore to receive the forward extension of the piston D. An annular recess S is formed in the bore of the washer R and a plurality of grooves T are formed radially across the face of the washer communicating with the recess S and with the atmosphere through an internal annular groove U in the front head adjacent the grooves T, and a plurality of holes V through thefront head from the annular groove U. v

In this way any motive .fiuid leaking past the forward extension of the piston D will be exhausted to atmosphere directly from the interior of the drill instead of passing through the drill steel as heretofore.

'Many drills designed to utilize air for blowing through the steel may be changed to eliminate the admission of air into the steeliby grinding the grooves S, T and U dustless feature.

I claim:

1. A fluid actuatedrock drill comprising a cylinder, ahammer piston having a re duced forward cylindrical extension 'to reciprocate within the cylinder, a front head having an'internal annular groove near its'rearward end and a plurality of holes extending from the groove through the wall of the front'head whereby said groove may communicate with the atmosphere, afront cylinder Washer having a hollow bore to receive the forward extension of the ham- 'merpiston arranged within the fronthead,

said washer having rearward andforward extensions extending within the cylinder and front head respectively, and an internal annular recess inits forward extensionyand a plurality of radial grooves in the forward face of the forward extension communicating with the said internal recess and with the annular groove in the front head to perm1t the exhaust of leakage motive fluid to atmosphere through the side of the front head. V y

2. A fluid actuated rock drill comprising a cylinder, a hammer piston having a reduced forward cylindrical extension to reciprocate within the cylinder, a front head having. an internal annular grooveirnear its rearward end and a plurality of holes extending from the groove through the wall of the front head whereb said roove ma.

communicate with the atmosphere, a hollow front cylinder washer, said washer having a short rearward extension to projectinto the cylinder and a long forward extension to project into the front head, an

internal annular recess at the end of the forward extension, a plurality of grooves formed radially in the endface of the forward extension communicating with the said internal recess and with the annular groove in the front head to permit the exhaust of leakage motive flnidfrom the interior of the chuck and from the front head to atmosphere. 1

In testimony whereof I have signed this specification.

' CHARLES C.v HAN SEN. 

